drivers/edac/edac_mc_sysfs.c

   1 /*
   2  * edac_mc kernel module
   3  * (C) 2005-2007 Linux Networx (http://lnxi.com)
   4  *
   5  * This file may be distributed under the terms of the
   6  * GNU General Public License.
   7  *
   8  * Written Doug Thompson <norsk5@xmission.com> www.softwarebitmaker.com
   9  *
  10  * (c) 2012 - Mauro Carvalho Chehab <mchehab@redhat.com>
  11  *      The entire API were re-written, and ported to use struct device
  12  *
  13  */
  14
  15 #include <linux/ctype.h>
  16 #include <linux/slab.h>
  17 #include <linux/edac.h>
  18 #include <linux/bug.h>
  19 #include <linux/pm_runtime.h>
  20 #include <linux/uaccess.h>
  21
  22 #include "edac_core.h"
  23 #include "edac_module.h"
  24
  25 /* MC EDAC Controls, setable by module parameter, and sysfs */
  26 static int edac_mc_log_ue = 1;
  27 static int edac_mc_log_ce = 1;
  28 static int edac_mc_panic_on_ue;
  29 static int edac_mc_poll_msec = 1000;
  30
  31 /* Getter functions for above */
  32 int edac_mc_get_log_ue(void)
  33 {
  34         return edac_mc_log_ue;
  35 }
  36
  37 int edac_mc_get_log_ce(void)
  38 {
  39         return edac_mc_log_ce;
  40 }
  41
  42 int edac_mc_get_panic_on_ue(void)
  43 {
  44         return edac_mc_panic_on_ue;
  45 }
  46
  47 /* this is temporary */
  48 int edac_mc_get_poll_msec(void)
  49 {
  50         return edac_mc_poll_msec;
  51 }
  52
  53 static int edac_set_poll_msec(const char *val, struct kernel_param *kp)
  54 {
  55         long l;
  56         int ret;
  57
  58         if (!val)
  59                 return -EINVAL;
  60
  61         ret = strict_strtol(val, 0, &l);
  62         if (ret == -EINVAL || ((int)l != l))
  63                 return -EINVAL;
  64         *((int *)kp->arg) = l;
  65
  66         /* notify edac_mc engine to reset the poll period */
  67         edac_mc_reset_delay_period(l);
  68
  69         return 0;
  70 }
  71
  72 /* Parameter declarations for above */
  73 module_param(edac_mc_panic_on_ue, int, 0644);
  74 MODULE_PARM_DESC(edac_mc_panic_on_ue, "Panic on uncorrected error: 0=off 1=on");
  75 module_param(edac_mc_log_ue, int, 0644);
  76 MODULE_PARM_DESC(edac_mc_log_ue,
  77                  "Log uncorrectable error to console: 0=off 1=on");
  78 module_param(edac_mc_log_ce, int, 0644);
  79 MODULE_PARM_DESC(edac_mc_log_ce,
  80                  "Log correctable error to console: 0=off 1=on");
  81 module_param_call(edac_mc_poll_msec, edac_set_poll_msec, param_get_int,
  82                   &edac_mc_poll_msec, 0644);
  83 MODULE_PARM_DESC(edac_mc_poll_msec, "Polling period in milliseconds");
  84
  85 static struct device *mci_pdev;
  86
  87 /*
  88  * various constants for Memory Controllers
  89  */
  90 static const char *mem_types[] = {
  91         [MEM_EMPTY] = "Empty",
  92         [MEM_RESERVED] = "Reserved",
  93         [MEM_UNKNOWN] = "Unknown",
  94         [MEM_FPM] = "FPM",
  95         [MEM_EDO] = "EDO",
  96         [MEM_BEDO] = "BEDO",
  97         [MEM_SDR] = "Unbuffered-SDR",
  98         [MEM_RDR] = "Registered-SDR",
  99         [MEM_DDR] = "Unbuffered-DDR",
 100         [MEM_RDDR] = "Registered-DDR",
 101         [MEM_RMBS] = "RMBS",
 102         [MEM_DDR2] = "Unbuffered-DDR2",
 103         [MEM_FB_DDR2] = "FullyBuffered-DDR2",
 104         [MEM_RDDR2] = "Registered-DDR2",
 105         [MEM_XDR] = "XDR",
 106         [MEM_DDR3] = "Unbuffered-DDR3",
 107         [MEM_RDDR3] = "Registered-DDR3"
 108 };
 109
 110 static const char *dev_types[] = {
 111         [DEV_UNKNOWN] = "Unknown",
 112         [DEV_X1] = "x1",
 113         [DEV_X2] = "x2",
 114         [DEV_X4] = "x4",
 115         [DEV_X8] = "x8",
 116         [DEV_X16] = "x16",
 117         [DEV_X32] = "x32",
 118         [DEV_X64] = "x64"
 119 };
 120
 121 static const char *edac_caps[] = {
 122         [EDAC_UNKNOWN] = "Unknown",
 123         [EDAC_NONE] = "None",
 124         [EDAC_RESERVED] = "Reserved",
 125         [EDAC_PARITY] = "PARITY",
 126         [EDAC_EC] = "EC",
 127         [EDAC_SECDED] = "SECDED",
 128         [EDAC_S2ECD2ED] = "S2ECD2ED",
 129         [EDAC_S4ECD4ED] = "S4ECD4ED",
 130         [EDAC_S8ECD8ED] = "S8ECD8ED",
 131         [EDAC_S16ECD16ED] = "S16ECD16ED"
 132 };
 133
 134 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 135 /*
 136  * EDAC sysfs CSROW data structures and methods
 137  */
 138
 139 #define to_csrow(k) container_of(k, struct csrow_info, dev)
 140
 141 /*
 142  * We need it to avoid namespace conflicts between the legacy API
 143  * and the per-dimm/per-rank one
 144  */
 145 #define DEVICE_ATTR_LEGACY(_name, _mode, _show, _store) \
 146         struct device_attribute dev_attr_legacy_##_name = __ATTR(_name, _mode, _show, _store)
 147
 148 struct dev_ch_attribute {
 149         struct device_attribute attr;
 150         int channel;
 151 };
 152
 153 #define DEVICE_CHANNEL(_name, _mode, _show, _store, _var) \
 154         struct dev_ch_attribute dev_attr_legacy_##_name = \
 155                 { __ATTR(_name, _mode, _show, _store), (_var) }
 156
 157 #define to_channel(k) (container_of(k, struct dev_ch_attribute, attr)->channel)
 158
 159 /* Set of more default csrow<id> attribute show/store functions */
 160 static ssize_t csrow_ue_count_show(struct device *dev,
 161                                    struct device_attribute *mattr, char *data)
 162 {
 163         struct csrow_info *csrow = to_csrow(dev);
 164
 165         return sprintf(data, "%u\n", csrow->ue_count);
 166 }
 167
 168 static ssize_t csrow_ce_count_show(struct device *dev,
 169                                    struct device_attribute *mattr, char *data)
 170 {
 171         struct csrow_info *csrow = to_csrow(dev);
 172
 173         return sprintf(data, "%u\n", csrow->ce_count);
 174 }
 175
 176 static ssize_t csrow_size_show(struct device *dev,
 177                                struct device_attribute *mattr, char *data)
 178 {
 179         struct csrow_info *csrow = to_csrow(dev);
 180         int i;
 181         u32 nr_pages = 0;
 182
 183         for (i = 0; i < csrow->nr_channels; i++)
 184                 nr_pages += csrow->channels[i]->dimm->nr_pages;
 185         return sprintf(data, "%u\n", PAGES_TO_MiB(nr_pages));
 186 }
 187
 188 static ssize_t csrow_mem_type_show(struct device *dev,
 189                                    struct device_attribute *mattr, char *data)
 190 {
 191         struct csrow_info *csrow = to_csrow(dev);
 192
 193         return sprintf(data, "%s\n", mem_types[csrow->channels[0]->dimm->mtype]);
 194 }
 195
 196 static ssize_t csrow_dev_type_show(struct device *dev,
 197                                    struct device_attribute *mattr, char *data)
 198 {
 199         struct csrow_info *csrow = to_csrow(dev);
 200
 201         return sprintf(data, "%s\n", dev_types[csrow->channels[0]->dimm->dtype]);
 202 }
 203
 204 static ssize_t csrow_edac_mode_show(struct device *dev,
 205                                     struct device_attribute *mattr,
 206                                     char *data)
 207 {
 208         struct csrow_info *csrow = to_csrow(dev);
 209
 210         return sprintf(data, "%s\n", edac_caps[csrow->channels[0]->dimm->edac_mode]);
 211 }
 212
 213 /* show/store functions for DIMM Label attributes */
 214 static ssize_t channel_dimm_label_show(struct device *dev,
 215                                        struct device_attribute *mattr,
 216                                        char *data)
 217 {
 218         struct csrow_info *csrow = to_csrow(dev);
 219         unsigned chan = to_channel(mattr);
 220         struct rank_info *rank = csrow->channels[chan];
 221
 222         /* if field has not been initialized, there is nothing to send */
 223         if (!rank->dimm->label[0])
 224                 return 0;
 225
 226         return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n",
 227                         rank->dimm->label);
 228 }
 229
 230 static ssize_t channel_dimm_label_store(struct device *dev,
 231                                         struct device_attribute *mattr,
 232                                         const char *data, size_t count)
 233 {
 234         struct csrow_info *csrow = to_csrow(dev);
 235         unsigned chan = to_channel(mattr);
 236         struct rank_info *rank = csrow->channels[chan];
 237
 238         ssize_t max_size = 0;
 239
 240         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 241         strncpy(rank->dimm->label, data, max_size);
 242         rank->dimm->label[max_size] = '\0';
 243
 244         return max_size;
 245 }
 246
 247 /* show function for dynamic chX_ce_count attribute */
 248 static ssize_t channel_ce_count_show(struct device *dev,
 249                                      struct device_attribute *mattr, char *data)
 250 {
 251         struct csrow_info *csrow = to_csrow(dev);
 252         unsigned chan = to_channel(mattr);
 253         struct rank_info *rank = csrow->channels[chan];
 254
 255         return sprintf(data, "%u\n", rank->ce_count);
 256 }
 257
 258 /* cwrow<id>/attribute files */
 259 DEVICE_ATTR_LEGACY(size_mb, S_IRUGO, csrow_size_show, NULL);
 260 DEVICE_ATTR_LEGACY(dev_type, S_IRUGO, csrow_dev_type_show, NULL);
 261 DEVICE_ATTR_LEGACY(mem_type, S_IRUGO, csrow_mem_type_show, NULL);
 262 DEVICE_ATTR_LEGACY(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL);
 263 DEVICE_ATTR_LEGACY(ue_count, S_IRUGO, csrow_ue_count_show, NULL);
 264 DEVICE_ATTR_LEGACY(ce_count, S_IRUGO, csrow_ce_count_show, NULL);
 265
 266 /* default attributes of the CSROW<id> object */
 267 static struct attribute *csrow_attrs[] = {
 268         &dev_attr_legacy_dev_type.attr,
 269         &dev_attr_legacy_mem_type.attr,
 270         &dev_attr_legacy_edac_mode.attr,
 271         &dev_attr_legacy_size_mb.attr,
 272         &dev_attr_legacy_ue_count.attr,
 273         &dev_attr_legacy_ce_count.attr,
 274         NULL,
 275 };
 276
 277 static struct attribute_group csrow_attr_grp = {
 278         .attrs  = csrow_attrs,
 279 };
 280
 281 static const struct attribute_group *csrow_attr_groups[] = {
 282         &csrow_attr_grp,
 283         NULL
 284 };
 285
 286 static void csrow_attr_release(struct device *dev)
 287 {
 288         struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
 289
 290         debugf1("Releasing csrow device %s\n", dev_name(dev));
 291         kfree(csrow);
 292 }
 293
 294 static struct device_type csrow_attr_type = {
 295         .groups         = csrow_attr_groups,
 296         .release        = csrow_attr_release,
 297 };
 298
 299 /*
 300  * possible dynamic channel DIMM Label attribute files
 301  *
 302  */
 303
 304 #define EDAC_NR_CHANNELS        6
 305
 306 DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR,
 307         channel_dimm_label_show, channel_dimm_label_store, 0);
 308 DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR,
 309         channel_dimm_label_show, channel_dimm_label_store, 1);
 310 DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR,
 311         channel_dimm_label_show, channel_dimm_label_store, 2);
 312 DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR,
 313         channel_dimm_label_show, channel_dimm_label_store, 3);
 314 DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR,
 315         channel_dimm_label_show, channel_dimm_label_store, 4);
 316 DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR,
 317         channel_dimm_label_show, channel_dimm_label_store, 5);
 318
 319 /* Total possible dynamic DIMM Label attribute file table */
 320 static struct device_attribute *dynamic_csrow_dimm_attr[] = {
 321         &dev_attr_legacy_ch0_dimm_label.attr,
 322         &dev_attr_legacy_ch1_dimm_label.attr,
 323         &dev_attr_legacy_ch2_dimm_label.attr,
 324         &dev_attr_legacy_ch3_dimm_label.attr,
 325         &dev_attr_legacy_ch4_dimm_label.attr,
 326         &dev_attr_legacy_ch5_dimm_label.attr
 327 };
 328
 329 /* possible dynamic channel ce_count attribute files */
 330 DEVICE_CHANNEL(ch0_ce_count, S_IRUGO | S_IWUSR,
 331                    channel_ce_count_show, NULL, 0);
 332 DEVICE_CHANNEL(ch1_ce_count, S_IRUGO | S_IWUSR,
 333                    channel_ce_count_show, NULL, 1);
 334 DEVICE_CHANNEL(ch2_ce_count, S_IRUGO | S_IWUSR,
 335                    channel_ce_count_show, NULL, 2);
 336 DEVICE_CHANNEL(ch3_ce_count, S_IRUGO | S_IWUSR,
 337                    channel_ce_count_show, NULL, 3);
 338 DEVICE_CHANNEL(ch4_ce_count, S_IRUGO | S_IWUSR,
 339                    channel_ce_count_show, NULL, 4);
 340 DEVICE_CHANNEL(ch5_ce_count, S_IRUGO | S_IWUSR,
 341                    channel_ce_count_show, NULL, 5);
 342
 343 /* Total possible dynamic ce_count attribute file table */
 344 static struct device_attribute *dynamic_csrow_ce_count_attr[] = {
 345         &dev_attr_legacy_ch0_ce_count.attr,
 346         &dev_attr_legacy_ch1_ce_count.attr,
 347         &dev_attr_legacy_ch2_ce_count.attr,
 348         &dev_attr_legacy_ch3_ce_count.attr,
 349         &dev_attr_legacy_ch4_ce_count.attr,
 350         &dev_attr_legacy_ch5_ce_count.attr
 351 };
 352
 353 static inline int nr_pages_per_csrow(struct csrow_info *csrow)
 354 {
 355         int chan, nr_pages = 0;
 356
 357         for (chan = 0; chan < csrow->nr_channels; chan++)
 358                 nr_pages += csrow->channels[chan]->dimm->nr_pages;
 359
 360         return nr_pages;
 361 }
 362
 363 /* Create a CSROW object under specifed edac_mc_device */
 364 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 365                                     struct csrow_info *csrow, int index)
 366 {
 367         int err, chan;
 368
 369         if (csrow->nr_channels >= EDAC_NR_CHANNELS)
 370                 return -ENODEV;
 371
 372         csrow->dev.type = &csrow_attr_type;
 373         csrow->dev.bus = &mci->bus;
 374         device_initialize(&csrow->dev);
 375         csrow->dev.parent = &mci->dev;
 376         dev_set_name(&csrow->dev, "csrow%d", index);
 377         dev_set_drvdata(&csrow->dev, csrow);
 378
 379         debugf0("%s(): creating (virtual) csrow node %s\n", __func__,
 380                 dev_name(&csrow->dev));
 381
 382         err = device_add(&csrow->dev);
 383         if (err < 0)
 384                 return err;
 385
 386         for (chan = 0; chan < csrow->nr_channels; chan++) {
 387                 /* Only expose populated DIMMs */
 388                 if (!csrow->channels[chan]->dimm->nr_pages)
 389                         continue;
 390                 err = device_create_file(&csrow->dev,
 391                                          dynamic_csrow_dimm_attr[chan]);
 392                 if (err < 0)
 393                         goto error;
 394                 err = device_create_file(&csrow->dev,
 395                                          dynamic_csrow_ce_count_attr[chan]);
 396                 if (err < 0) {
 397                         device_remove_file(&csrow->dev,
 398                                            dynamic_csrow_dimm_attr[chan]);
 399                         goto error;
 400                 }
 401         }
 402
 403         return 0;
 404
 405 error:
 406         for (--chan; chan >= 0; chan--) {
 407                 device_remove_file(&csrow->dev,
 408                                         dynamic_csrow_dimm_attr[chan]);
 409                 device_remove_file(&csrow->dev,
 410                                            dynamic_csrow_ce_count_attr[chan]);
 411         }
 412         put_device(&csrow->dev);
 413
 414         return err;
 415 }
 416
 417 /* Create a CSROW object under specifed edac_mc_device */
 418 static int edac_create_csrow_objects(struct mem_ctl_info *mci)
 419 {
 420         int err, i, chan;
 421         struct csrow_info *csrow;
 422
 423         for (i = 0; i < mci->nr_csrows; i++) {
 424                 csrow = mci->csrows[i];
 425                 if (!nr_pages_per_csrow(csrow))
 426                         continue;
 427                 err = edac_create_csrow_object(mci, mci->csrows[i], i);
 428                 if (err < 0)
 429                         goto error;
 430         }
 431         return 0;
 432
 433 error:
 434         for (--i; i >= 0; i--) {
 435                 csrow = mci->csrows[i];
 436                 if (!nr_pages_per_csrow(csrow))
 437                         continue;
 438                 for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
 439                         if (!csrow->channels[chan]->dimm->nr_pages)
 440                                 continue;
 441                         device_remove_file(&csrow->dev,
 442                                                 dynamic_csrow_dimm_attr[chan]);
 443                         device_remove_file(&csrow->dev,
 444                                                 dynamic_csrow_ce_count_attr[chan]);
 445                 }
 446                 put_device(&mci->csrows[i]->dev);
 447         }
 448
 449         return err;
 450 }
 451
 452 static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
 453 {
 454         int i, chan;
 455         struct csrow_info *csrow;
 456
 457         for (i = mci->nr_csrows - 1; i >= 0; i--) {
 458                 csrow = mci->csrows[i];
 459                 if (!nr_pages_per_csrow(csrow))
 460                         continue;
 461                 for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
 462                         if (!csrow->channels[chan]->dimm->nr_pages)
 463                                 continue;
 464                         debugf1("Removing csrow %d channel %d sysfs nodes\n",
 465                                 i, chan);
 466                         device_remove_file(&csrow->dev,
 467                                                 dynamic_csrow_dimm_attr[chan]);
 468                         device_remove_file(&csrow->dev,
 469                                                 dynamic_csrow_ce_count_attr[chan]);
 470                 }
 471                 put_device(&mci->csrows[i]->dev);
 472                 device_del(&mci->csrows[i]->dev);
 473         }
 474 }
 475 #endif
 476
 477 /*
 478  * Per-dimm (or per-rank) devices
 479  */
 480
 481 #define to_dimm(k) container_of(k, struct dimm_info, dev)
 482
 483 /* show/store functions for DIMM Label attributes */
 484 static ssize_t dimmdev_location_show(struct device *dev,
 485                                      struct device_attribute *mattr, char *data)
 486 {
 487         struct dimm_info *dimm = to_dimm(dev);
 488         struct mem_ctl_info *mci = dimm->mci;
 489         int i;
 490         char *p = data;
 491
 492         for (i = 0; i < mci->n_layers; i++) {
 493                 p += sprintf(p, "%s %d ",
 494                              edac_layer_name[mci->layers[i].type],
 495                              dimm->location[i]);
 496         }
 497
 498         return p - data;
 499 }
 500
 501 static ssize_t dimmdev_label_show(struct device *dev,
 502                                   struct device_attribute *mattr, char *data)
 503 {
 504         struct dimm_info *dimm = to_dimm(dev);
 505
 506         /* if field has not been initialized, there is nothing to send */
 507         if (!dimm->label[0])
 508                 return 0;
 509
 510         return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n", dimm->label);
 511 }
 512
 513 static ssize_t dimmdev_label_store(struct device *dev,
 514                                    struct device_attribute *mattr,
 515                                    const char *data,
 516                                    size_t count)
 517 {
 518         struct dimm_info *dimm = to_dimm(dev);
 519
 520         ssize_t max_size = 0;
 521
 522         max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
 523         strncpy(dimm->label, data, max_size);
 524         dimm->label[max_size] = '\0';
 525
 526         return max_size;
 527 }
 528
 529 static ssize_t dimmdev_size_show(struct device *dev,
 530                                  struct device_attribute *mattr, char *data)
 531 {
 532         struct dimm_info *dimm = to_dimm(dev);
 533
 534         return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages));
 535 }
 536
 537 static ssize_t dimmdev_mem_type_show(struct device *dev,
 538                                      struct device_attribute *mattr, char *data)
 539 {
 540         struct dimm_info *dimm = to_dimm(dev);
 541
 542         return sprintf(data, "%s\n", mem_types[dimm->mtype]);
 543 }
 544
 545 static ssize_t dimmdev_dev_type_show(struct device *dev,
 546                                      struct device_attribute *mattr, char *data)
 547 {
 548         struct dimm_info *dimm = to_dimm(dev);
 549
 550         return sprintf(data, "%s\n", dev_types[dimm->dtype]);
 551 }
 552
 553 static ssize_t dimmdev_edac_mode_show(struct device *dev,
 554                                       struct device_attribute *mattr,
 555                                       char *data)
 556 {
 557         struct dimm_info *dimm = to_dimm(dev);
 558
 559         return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]);
 560 }
 561
 562 /* dimm/rank attribute files */
 563 static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR,
 564                    dimmdev_label_show, dimmdev_label_store);
 565 static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL);
 566 static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL);
 567 static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL);
 568 static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL);
 569 static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL);
 570
 571 /* attributes of the dimm<id>/rank<id> object */
 572 static struct attribute *dimm_attrs[] = {
 573         &dev_attr_dimm_label.attr,
 574         &dev_attr_dimm_location.attr,
 575         &dev_attr_size.attr,
 576         &dev_attr_dimm_mem_type.attr,
 577         &dev_attr_dimm_dev_type.attr,
 578         &dev_attr_dimm_edac_mode.attr,
 579         NULL,
 580 };
 581
 582 static struct attribute_group dimm_attr_grp = {
 583         .attrs  = dimm_attrs,
 584 };
 585
 586 static const struct attribute_group *dimm_attr_groups[] = {
 587         &dimm_attr_grp,
 588         NULL
 589 };
 590
 591 static void dimm_attr_release(struct device *dev)
 592 {
 593         struct dimm_info *dimm = container_of(dev, struct dimm_info, dev);
 594
 595         debugf1("Releasing dimm device %s\n", dev_name(dev));
 596         kfree(dimm);
 597 }
 598
 599 static struct device_type dimm_attr_type = {
 600         .groups         = dimm_attr_groups,
 601         .release        = dimm_attr_release,
 602 };
 603
 604 /* Create a DIMM object under specifed memory controller device */
 605 static int edac_create_dimm_object(struct mem_ctl_info *mci,
 606                                    struct dimm_info *dimm,
 607                                    int index)
 608 {
 609         int err;
 610         dimm->mci = mci;
 611
 612         dimm->dev.type = &dimm_attr_type;
 613         dimm->dev.bus = &mci->bus;
 614         device_initialize(&dimm->dev);
 615
 616         dimm->dev.parent = &mci->dev;
 617         if (mci->mem_is_per_rank)
 618                 dev_set_name(&dimm->dev, "rank%d", index);
 619         else
 620                 dev_set_name(&dimm->dev, "dimm%d", index);
 621         dev_set_drvdata(&dimm->dev, dimm);
 622         pm_runtime_forbid(&mci->dev);
 623
 624         err =  device_add(&dimm->dev);
 625
 626         debugf0("%s(): creating rank/dimm device %s\n", __func__,
 627                 dev_name(&dimm->dev));
 628
 629         return err;
 630 }
 631
 632 /*
 633  * Memory controller device
 634  */
 635
 636 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 637
 638 static ssize_t mci_reset_counters_store(struct device *dev,
 639                                         struct device_attribute *mattr,
 640                                         const char *data, size_t count)
 641 {
 642         struct mem_ctl_info *mci = to_mci(dev);
 643         int cnt, row, chan, i;
 644         mci->ue_mc = 0;
 645         mci->ce_mc = 0;
 646         mci->ue_noinfo_count = 0;
 647         mci->ce_noinfo_count = 0;
 648
 649         for (row = 0; row < mci->nr_csrows; row++) {
 650                 struct csrow_info *ri = mci->csrows[row];
 651
 652                 ri->ue_count = 0;
 653                 ri->ce_count = 0;
 654
 655                 for (chan = 0; chan < ri->nr_channels; chan++)
 656                         ri->channels[chan]->ce_count = 0;
 657         }
 658
 659         cnt = 1;
 660         for (i = 0; i < mci->n_layers; i++) {
 661                 cnt *= mci->layers[i].size;
 662                 memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
 663                 memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
 664         }
 665
 666         mci->start_time = jiffies;
 667         return count;
 668 }
 669
 670 /* Memory scrubbing interface:
 671  *
 672  * A MC driver can limit the scrubbing bandwidth based on the CPU type.
 673  * Therefore, ->set_sdram_scrub_rate should be made to return the actual
 674  * bandwidth that is accepted or 0 when scrubbing is to be disabled.
 675  *
 676  * Negative value still means that an error has occurred while setting
 677  * the scrub rate.
 678  */
 679 static ssize_t mci_sdram_scrub_rate_store(struct device *dev,
 680                                           struct device_attribute *mattr,
 681                                           const char *data, size_t count)
 682 {
 683         struct mem_ctl_info *mci = to_mci(dev);
 684         unsigned long bandwidth = 0;
 685         int new_bw = 0;
 686
 687         if (!mci->set_sdram_scrub_rate)
 688                 return -ENODEV;
 689
 690         if (strict_strtoul(data, 10, &bandwidth) < 0)
 691                 return -EINVAL;
 692
 693         new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
 694         if (new_bw < 0) {
 695                 edac_printk(KERN_WARNING, EDAC_MC,
 696                             "Error setting scrub rate to: %lu\n", bandwidth);
 697                 return -EINVAL;
 698         }
 699
 700         return count;
 701 }
 702
 703 /*
 704  * ->get_sdram_scrub_rate() return value semantics same as above.
 705  */
 706 static ssize_t mci_sdram_scrub_rate_show(struct device *dev,
 707                                          struct device_attribute *mattr,
 708                                          char *data)
 709 {
 710         struct mem_ctl_info *mci = to_mci(dev);
 711         int bandwidth = 0;
 712
 713         if (!mci->get_sdram_scrub_rate)
 714                 return -ENODEV;
 715
 716         bandwidth = mci->get_sdram_scrub_rate(mci);
 717         if (bandwidth < 0) {
 718                 edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
 719                 return bandwidth;
 720         }
 721
 722         return sprintf(data, "%d\n", bandwidth);
 723 }
 724
 725 /* default attribute files for the MCI object */
 726 static ssize_t mci_ue_count_show(struct device *dev,
 727                                  struct device_attribute *mattr,
 728                                  char *data)
 729 {
 730         struct mem_ctl_info *mci = to_mci(dev);
 731
 732         return sprintf(data, "%d\n", mci->ue_mc);
 733 }
 734
 735 static ssize_t mci_ce_count_show(struct device *dev,
 736                                  struct device_attribute *mattr,
 737                                  char *data)
 738 {
 739         struct mem_ctl_info *mci = to_mci(dev);
 740
 741         return sprintf(data, "%d\n", mci->ce_mc);
 742 }
 743
 744 static ssize_t mci_ce_noinfo_show(struct device *dev,
 745                                   struct device_attribute *mattr,
 746                                   char *data)
 747 {
 748         struct mem_ctl_info *mci = to_mci(dev);
 749
 750         return sprintf(data, "%d\n", mci->ce_noinfo_count);
 751 }
 752
 753 static ssize_t mci_ue_noinfo_show(struct device *dev,
 754                                   struct device_attribute *mattr,
 755                                   char *data)
 756 {
 757         struct mem_ctl_info *mci = to_mci(dev);
 758
 759         return sprintf(data, "%d\n", mci->ue_noinfo_count);
 760 }
 761
 762 static ssize_t mci_seconds_show(struct device *dev,
 763                                 struct device_attribute *mattr,
 764                                 char *data)
 765 {
 766         struct mem_ctl_info *mci = to_mci(dev);
 767
 768         return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
 769 }
 770
 771 static ssize_t mci_ctl_name_show(struct device *dev,
 772                                  struct device_attribute *mattr,
 773                                  char *data)
 774 {
 775         struct mem_ctl_info *mci = to_mci(dev);
 776
 777         return sprintf(data, "%s\n", mci->ctl_name);
 778 }
 779
 780 static ssize_t mci_size_mb_show(struct device *dev,
 781                                 struct device_attribute *mattr,
 782                                 char *data)
 783 {
 784         struct mem_ctl_info *mci = to_mci(dev);
 785         int total_pages = 0, csrow_idx, j;
 786
 787         for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
 788                 struct csrow_info *csrow = mci->csrows[csrow_idx];
 789
 790                 for (j = 0; j < csrow->nr_channels; j++) {
 791                         struct dimm_info *dimm = csrow->channels[j]->dimm;
 792
 793                         total_pages += dimm->nr_pages;
 794                 }
 795         }
 796
 797         return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
 798 }
 799
 800 static ssize_t mci_max_location_show(struct device *dev,
 801                                      struct device_attribute *mattr,
 802                                      char *data)
 803 {
 804         struct mem_ctl_info *mci = to_mci(dev);
 805         int i;
 806         char *p = data;
 807
 808         for (i = 0; i < mci->n_layers; i++) {
 809                 p += sprintf(p, "%s %d ",
 810                              edac_layer_name[mci->layers[i].type],
 811                              mci->layers[i].size - 1);
 812         }
 813
 814         return p - data;
 815 }
 816
 817 #ifdef CONFIG_EDAC_DEBUG
 818 static ssize_t edac_fake_inject_write(struct file *file,
 819                                       const char __user *data,
 820                                       size_t count, loff_t *ppos)
 821 {
 822         struct device *dev = file->private_data;
 823         struct mem_ctl_info *mci = to_mci(dev);
 824         static enum hw_event_mc_err_type type;
 825
 826         type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
 827                                    : HW_EVENT_ERR_CORRECTED;
 828
 829         printk(KERN_DEBUG
 830                "Generating a %s fake error to %d.%d.%d to test core handling. NOTE: this won't test the driver-specific decoding logic.\n",
 831                 (type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
 832                 mci->fake_inject_layer[0],
 833                 mci->fake_inject_layer[1],
 834                 mci->fake_inject_layer[2]
 835                );
 836         edac_mc_handle_error(type, mci, 0, 0, 0,
 837                              mci->fake_inject_layer[0],
 838                              mci->fake_inject_layer[1],
 839                              mci->fake_inject_layer[2],
 840                              "FAKE ERROR", "for EDAC testing only", NULL);
 841
 842         return count;
 843 }
 844
 845 static int debugfs_open(struct inode *inode, struct file *file)
 846 {
 847         file->private_data = inode->i_private;
 848         return 0;
 849 }
 850
 851 static const struct file_operations debug_fake_inject_fops = {
 852         .open = debugfs_open,
 853         .write = edac_fake_inject_write,
 854         .llseek = generic_file_llseek,
 855 };
 856 #endif
 857
 858 /* default Control file */
 859 DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
 860
 861 /* default Attribute files */
 862 DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
 863 DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
 864 DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
 865 DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
 866 DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
 867 DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
 868 DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);
 869 DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL);
 870
 871 /* memory scrubber attribute file */
 872 DEVICE_ATTR(sdram_scrub_rate, S_IRUGO | S_IWUSR, mci_sdram_scrub_rate_show,
 873         mci_sdram_scrub_rate_store);
 874
 875 static struct attribute *mci_attrs[] = {
 876         &dev_attr_reset_counters.attr,
 877         &dev_attr_mc_name.attr,
 878         &dev_attr_size_mb.attr,
 879         &dev_attr_seconds_since_reset.attr,
 880         &dev_attr_ue_noinfo_count.attr,
 881         &dev_attr_ce_noinfo_count.attr,
 882         &dev_attr_ue_count.attr,
 883         &dev_attr_ce_count.attr,
 884         &dev_attr_sdram_scrub_rate.attr,
 885         &dev_attr_max_location.attr,
 886         NULL
 887 };
 888
 889 static struct attribute_group mci_attr_grp = {
 890         .attrs  = mci_attrs,
 891 };
 892
 893 static const struct attribute_group *mci_attr_groups[] = {
 894         &mci_attr_grp,
 895         NULL
 896 };
 897
 898 static void mci_attr_release(struct device *dev)
 899 {
 900         struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
 901
 902         debugf1("Releasing csrow device %s\n", dev_name(dev));
 903         kfree(mci);
 904 }
 905
 906 static struct device_type mci_attr_type = {
 907         .groups         = mci_attr_groups,
 908         .release        = mci_attr_release,
 909 };
 910
 911 #ifdef CONFIG_EDAC_DEBUG
 912 int edac_create_debug_nodes(struct mem_ctl_info *mci)
 913 {
 914         struct dentry *d, *parent;
 915         char name[80];
 916         int i;
 917
 918         d = debugfs_create_dir(mci->dev.kobj.name, mci->debugfs);
 919         if (!d)
 920                 return -ENOMEM;
 921         parent = d;
 922
 923         for (i = 0; i < mci->n_layers; i++) {
 924                 sprintf(name, "fake_inject_%s",
 925                              edac_layer_name[mci->layers[i].type]);
 926                 d = debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
 927                                       &mci->fake_inject_layer[i]);
 928                 if (!d)
 929                         goto nomem;
 930         }
 931
 932         d = debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
 933                                 &mci->fake_inject_ue);
 934         if (!d)
 935                 goto nomem;
 936
 937         d = debugfs_create_file("fake_inject", S_IWUSR, parent,
 938                                 &mci->dev,
 939                                 &debug_fake_inject_fops);
 940         if (!d)
 941                 goto nomem;
 942
 943         return 0;
 944 nomem:
 945         debugfs_remove(mci->debugfs);
 946         return -ENOMEM;
 947 }
 948 #endif
 949
 950 /*
 951  * Create a new Memory Controller kobject instance,
 952  *      mc<id> under the 'mc' directory
 953  *
 954  * Return:
 955  *      0       Success
 956  *      !0      Failure
 957  */
 958 int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 959 {
 960         int i, err;
 961
 962         /*
 963          * The memory controller needs its own bus, in order to avoid
 964          * namespace conflicts at /sys/bus/edac.
 965          */
 966         mci->bus.name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
 967         if (!mci->bus.name)
 968                 return -ENOMEM;
 969         debugf0("creating bus %s\n",mci->bus.name);
 970         err = bus_register(&mci->bus);
 971         if (err < 0)
 972                 return err;
 973
 974         /* get the /sys/devices/system/edac subsys reference */
 975         mci->dev.type = &mci_attr_type;
 976         device_initialize(&mci->dev);
 977
 978         mci->dev.parent = mci_pdev;
 979         mci->dev.bus = &mci->bus;
 980         dev_set_name(&mci->dev, "mc%d", mci->mc_idx);
 981         dev_set_drvdata(&mci->dev, mci);
 982         pm_runtime_forbid(&mci->dev);
 983
 984         debugf0("%s(): creating device %s\n", __func__,
 985                 dev_name(&mci->dev));
 986         err = device_add(&mci->dev);
 987         if (err < 0) {
 988                 bus_unregister(&mci->bus);
 989                 kfree(mci->bus.name);
 990                 return err;
 991         }
 992
 993         /*
 994          * Create the dimm/rank devices
 995          */
 996         for (i = 0; i < mci->tot_dimms; i++) {
 997                 struct dimm_info *dimm = mci->dimms[i];
 998                 /* Only expose populated DIMMs */
 999                 if (dimm->nr_pages == 0)
1000                         continue;
1001 #ifdef CONFIG_EDAC_DEBUG
1002                 debugf1("%s creating dimm%d, located at ",
1003                         __func__, i);
1004                 if (edac_debug_level >= 1) {
1005                         int lay;
1006                         for (lay = 0; lay < mci->n_layers; lay++)
1007                                 printk(KERN_CONT "%s %d ",
1008                                         edac_layer_name[mci->layers[lay].type],
1009                                         dimm->location[lay]);
1010                         printk(KERN_CONT "\n");
1011                 }
1012 #endif
1013                 err = edac_create_dimm_object(mci, dimm, i);
1014                 if (err) {
1015                         debugf1("%s() failure: create dimm %d obj\n",
1016                                 __func__, i);
1017                         goto fail;
1018                 }
1019         }
1020
1021 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1022         err = edac_create_csrow_objects(mci);
1023         if (err < 0)
1024                 goto fail;
1025 #endif
1026
1027 #ifdef CONFIG_EDAC_DEBUG
1028         edac_create_debug_nodes(mci);
1029 #endif
1030         return 0;
1031
1032 fail:
1033         for (i--; i >= 0; i--) {
1034                 struct dimm_info *dimm = mci->dimms[i];
1035                 if (dimm->nr_pages == 0)
1036                         continue;
1037                 put_device(&dimm->dev);
1038                 device_del(&dimm->dev);
1039         }
1040         put_device(&mci->dev);
1041         device_del(&mci->dev);
1042         bus_unregister(&mci->bus);
1043         kfree(mci->bus.name);
1044         return err;
1045 }
1046
1047 /*
1048  * remove a Memory Controller instance
1049  */
1050 void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
1051 {
1052         int i;
1053
1054         debugf0("%s()\n", __func__);
1055
1056 #ifdef CONFIG_EDAC_DEBUG
1057         debugfs_remove(mci->debugfs);
1058 #endif
1059 #ifdef CONFIG_EDAC_LEGACY_SYSFS
1060         edac_delete_csrow_objects(mci);
1061 #endif
1062
1063         for (i = 0; i < mci->tot_dimms; i++) {
1064                 struct dimm_info *dimm = mci->dimms[i];
1065                 if (dimm->nr_pages == 0)
1066                         continue;
1067                 debugf0("%s(): removing device %s\n", __func__,
1068                         dev_name(&dimm->dev));
1069                 put_device(&dimm->dev);
1070                 device_del(&dimm->dev);
1071         }
1072 }
1073
1074 void edac_unregister_sysfs(struct mem_ctl_info *mci)
1075 {
1076         debugf1("Unregistering device %s\n", dev_name(&mci->dev));
1077         put_device(&mci->dev);
1078         device_del(&mci->dev);
1079         bus_unregister(&mci->bus);
1080         kfree(mci->bus.name);
1081 }
1082
1083 static void mc_attr_release(struct device *dev)
1084 {
1085         /*
1086          * There's no container structure here, as this is just the mci
1087          * parent device, used to create the /sys/devices/mc sysfs node.
1088          * So, there are no attributes on it.
1089          */
1090         debugf1("Releasing device %s\n", dev_name(dev));
1091         kfree(dev);
1092 }
1093
1094 static struct device_type mc_attr_type = {
1095         .release        = mc_attr_release,
1096 };
1097 /*
1098  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
1099  */
1100 int __init edac_mc_sysfs_init(void)
1101 {
1102         struct bus_type *edac_subsys;
1103         int err;
1104
1105         /* get the /sys/devices/system/edac subsys reference */
1106         edac_subsys = edac_get_sysfs_subsys();
1107         if (edac_subsys == NULL) {
1108                 debugf1("%s() no edac_subsys\n", __func__);
1109                 return -EINVAL;
1110         }
1111
1112         mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL);
1113
1114         mci_pdev->bus = edac_subsys;
1115         mci_pdev->type = &mc_attr_type;
1116         device_initialize(mci_pdev);
1117         dev_set_name(mci_pdev, "mc");
1118
1119         err = device_add(mci_pdev);
1120         if (err < 0)
1121                 return err;
1122
1123         debugf0("device %s created\n", dev_name(mci_pdev));
1124
1125         return 0;
1126 }
1127
1128 void __exit edac_mc_sysfs_exit(void)
1129 {
1130         put_device(mci_pdev);
1131         device_del(mci_pdev);
1132         edac_put_sysfs_subsys();
1133 }